81736810973 has 8 divisors (see below), whose sum is σ = 81877311360. Its totient is φ = 81596417760.

The previous prime is 81736810957. The next prime is 81736810979. The reversal of 81736810973 is 37901863718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81736810973 - 2⁴ = 81736810957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81736810979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1581761 + ... + 1632617.

It is an arithmetic number, because the mean of its divisors is an integer number (10234663920).

Almost surely, 2^81736810973 is an apocalyptic number.

It is an amenable number.

81736810973 is a deficient number, since it is larger than the sum of its proper divisors (140500387).

81736810973 is a wasteful number, since it uses less digits than its factorization.

81736810973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53587.

The product of its (nonzero) digits is 1524096, while the sum is 53.

The spelling of 81736810973 in words is "eighty-one billion, seven hundred thirty-six million, eight hundred ten thousand, nine hundred seventy-three".